초록 ▼

A blood pump preferably has a magnetically suspended rotor that rotates within a housing. The rotor may rotate about a stator disposed within the housing. Radial magnetic bearings may be defined within the stator and the rotor in order to suspend the rotor. The radial magnetic bearings may be passiv

A blood pump preferably has a magnetically suspended rotor that rotates within a housing. The rotor may rotate about a stator disposed within the housing. Radial magnetic bearings may be defined within the stator and the rotor in order to suspend the rotor. The radial magnetic bearings may be passive magnetic bearings that include permanent magnets disposed within the stator and the rotor or active magnetic bearings. The pump may further include an axial magnetic bearing that may be either a passive or an active magnetic bearing. A motor that drives the rotor may be disposed within the housing in order to more easily dissipate heat generated by the motor. A primary flow path is defined between the rotor and the stator, and a secondary flow path is defined between the stator and the rotor. Preferably, a substantial majority of blood passes through the primary flow path. The secondary flow path is large enough so that it provides adequate flushing of the secondary flow path while being small enough to permit efficient operation of the radial magnet bearings across the secondary flow path.

대표청구항 ▼

[ What is claimed is:] [1.]1. A pump for pumping blood, comprising:a housing;a stator, disposed within the housing and being coupled to the housing, and comprising:(i) a first end, disposed at the inlet, about which a plurality of stator blades are disposed and that has a first diameter;(ii) a secon

[ What is claimed is:] [1.]1. A pump for pumping blood, comprising:a housing;a stator, disposed within the housing and being coupled to the housing, and comprising:(i) a first end, disposed at the inlet, about which a plurality of stator blades are disposed and that has a first diameter;(ii) a second end, disposed at the outlet, that is substantially conically shaped and about which a plurality of stator blades are disposed, the second end having a second diameter that is larger than the first diameter;(iii) a stationary hub that connects the first end to the second end and having a third diameter that is smaller than the second diameter;a rotor, disposed within the housing and suspended around the stationary hub;a radial magnetic bearing, defined by a stator magnet disposed within the stator and a rotor magnet disposed within the rotor, that magnetically suspends the rotor between the stator and the housing;a primary blood flow path being defined between the rotor and the housing;a secondary blood flow path being defined between the rotor and the stator, the primary flow path being larger than the secondary flow path and the secondary flow path being sized so that the stator magnet can interact with the rotor magnet and so that shear stresses on the blood flowing through the pump are minimized; anda motor, disposed within the housing, the motor communicating with the rotor across the primary flow path to rotate the rotor and thereby pump blood through the pump.